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1、Unit 1 The Amazon rainforest: a natural treasureWelcome to the jungle,_ green _ the sounds of animals.This is the Amazon rainforest. As the _(large) rainforest in the world, it plays a significant role in _ (maintain) the fine balance of the Earths ecosystem.The Amazon rainforest crosses into eight
2、countries, _(include) Brazil and Peru, and one overseas region of France, all _ the South American continent. With an area of around 6 million square kilometers, the Amazon rainforest is more than half _ China.The Amazon River, from _ the rainforest gets its name, _ 6,400 kilometers in _(long) rough
3、ly 100 kilometers longer than the Yangtze River. On its journey from the mountains to the ocean, the river supports many different ecosystems. They give this area the_ (rich) biodiversity on the Earth: _ known species in the world can be found here. Of the 390,000 plant species _(know) to us, more t
4、han 40,000 can be found in the Amazon. This tall and ancient Brazil nut tree produces nuts that we can eat; these water lilies are big enough to_. The forests different levels support an _(believable) variety of wildlife. _ the bottom, there is a system of roots _ the ground. Above that is the mass
5、of leaf litter on the dark forest floor. The next level is made up of shorter plants with large leaves. Then there are the towering ancient _, and finally the tops of the tallest trees many meters above the ground. Each level of the forest _(form) its own little world, home to different kinds of _(l
6、ive) things.More than 1,300 species of birds and over 400 species of mammals hide _ the jungles plant life. This jaguar is one example.It has a yellowishbrown coat with black spots. _ a significant number of jaguars survive here, they are only one _ of this forests food chain. They feed _ at least 8
7、7 species, including frogs. These frogs, _, feed on insects which eat leaves and fruit. When a jaguar _(die), a tiny army of microorganisms helps break _ its body and return the _ to the earth.The Amazon rainforest _ the planet by _(fix) carbon and _(produce) over 20 per cent of all the Earths oxyge
8、n. Thus, it is often _(know) as the “lungs of the planet”. Moreover, the Amazon rainforest is a treasure house of species that can be used _ food or medicine. Yet there is one major danger_ these _(replaceable) plants and animals: us. Over the past 50 years, about 17 per cent of the rainforest has d
9、isappeared _ human activities such as agriculture and cattle farming. _ the impact of human activities continues to grow and the list of species in danger of _ becomes longer, we are _(leave) with a question: can we afford _(damage) the “lungs of the planet”?More than 1,300 species of birds and over
10、 400 species of mammals hide _ the jungles plant life. This jaguar is one example.It has a yellowishbrown coat with black spots. _ a significant number of jaguars survive here, they are only one _ of this forests food chain. They feed _ at least 87 species, including frogs. These frogs, _, feed on i
11、nsects which eat leaves and fruit. When a jaguar _(die), a tiny army of microorganisms helps break _ its body and return the _ to the earth.The Amazon rainforest _ the planet by _(fix) carbon and _(produce) over 20 per cent of all the Earths oxygen. Thus, it is often _(know) as the “lungs of the pla
12、net”. Moreover, the Amazon rainforest is a treasure house of species that can be used _ food or medicine. Yet there is one major danger_ these _(replaceable) plants and animals: us. Over the past 50 years, about 17 per cent of the rainforest has disappeared _ human activities such as agriculture and
13、 cattle farming. _ the impact of human activities continues to grow and the list of species in danger of _ becomes longer, we are _(leave) with a question: can we afford _(damage) the “lungs of the planet”?Unit 1 The Amazon rainforest: a natural treasureWelcome to the jungle,_ green _ the sounds of
14、animals.This is the Amazon rainforest. As the _(large) rainforest in the world, it plays a significant role in _ (maintain) the fine balance of the Earths ecosystem.The Amazon rainforest crosses into eight countries, _(include) Brazil and Peru, and one overseas region of France, all _ the South Amer
15、ican continent. With an area of around 6 million square kilometers, the Amazon rainforest is more than half _ China.The Amazon River, from _ the rainforest gets its name, _ 6,400 kilometers in _(long) roughly 100 kilometers longer than the Yangtze River. On its journey from the mountains to the ocea
16、n, the river supports many different ecosystems. They give this area the_ (rich) biodiversity on the Earth: _ known species in the world can be found here. Of the 390,000 plant species _(know) to us, more than 40,000 can be found in the Amazon. This tall and ancient Brazil nut tree produces nuts tha
17、t we can eat; these water lilies are big enough to_. The forests different levels support an _(believable) variety of wildlife. _ the bottom, there is a system of roots _ the ground. Above that is the mass of leaf litter on the dark forest floor. The next level is made up of shorter plants with large leaves. Then there are the towering ancient _, and finally the tops of the tallest trees many meters above the ground. Each level of the forest _(form) its own little world, home to different kinds of _(live) things.学科网（北京）股份有限公司